How to use the pyexcelerate.Workbook.Workbook.STYLE_ATTRIBUTE_MAP.keys function in PyExcelerate

def _align_styles(self):
        Utility.YOLO = True
        items = dict([(x, {}) for x in Workbook.STYLE_ATTRIBUTE_MAP.keys()])
        styles = {}
        for index, style in enumerate(self._styles):
            # compress style
            if not style.is_default:
                styles[style] = styles.get(style, len(styles) + 1)
                setattr(style, Workbook.STYLE_ID_ATTRIBUTE, styles[style])
        for style in styles.keys():
            # compress individual attributes
            for attr, attr_id in Workbook.STYLE_ATTRIBUTE_MAP.items():
                obj = getattr(style, attr_id)
                if obj and not obj.is_default:  # we only care about it if it's not default
                    items[attr][obj] = items[attr].get(obj,
                                                       len(items[attr]) + 1)
                    obj.id = items[attr][obj]  # apply
        for k, v in items.items():
            # ensure it's sorted properly